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Re: FET OPAs for mikes

 

:)

As Jerry Lee said, the OPA1655 could be the closest to the specs: 4苍痴√贬锄??@1kHz, and 2.9苍痴√贬锄??@10Khz. 3.9mA quiescent current, and it also has low distortion.

Here is the Vn graph, from the PDF spec sheet.
image.png

Stay salty and sandy! :)

Regards!

HL

El jue, 10 abr 2025 a la(s) 7:36?p.m., Richard Lee via (ricardo_lee=[email protected]) escribió:
What do you think about having a 2SK170 or a?LSK189?FET and an OPA1611, using the OCCAM-3B configuration,?from Zapnspark?
In Jurassic times, I did a lot of work trying to splice a LN transistor into a DIP OPA.? My most successful was with LM301 cos you can disable the i/p stage and feed the LN transistor output into the offset pins.
?
When 5532/4 came out, all this work went into the Don't Recycle bin.? We were Beta testers for the original 5534, called Mullard 1034 at the time.
Not strictly a single OPA solution, but if you need really low noise, this may be a good option.
Homero, don't forget I'm a REAL beach bum.? This is just a mental exercise on Jurassic topics for me cos the weather is too bad to go diving?
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